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US3886254A
Expired / Lapsed
US
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Method of making ceramic sintered body
Assignee: Niterra Co Ltd
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Filing: 1973-09-24
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Granted: 1975-05-27
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Expires: 1993-09-24
Abstract
Abstract A method of making a ceramic sintered body, comprising preparing a powder-mixture consisting of 40 to 80 percent by weight of alumina with or without replacing not more than 2 percent by weight by a grain growth inhibitor, 16 to 40 percent by weight of titanium carbide and 4 to 20 percent by weight of metallic titanium, the total being 100 percent by weight, and hot-pressing said mixture. The mixture is not subjected to a calcination in nonoxidizing atmosphere at a temperature of 600*C to 1,000*C as previously proposed by the inventors, but it is directly subjected to hot-press forming at a high temperature under a high pressure.
Inventors
- 👤 Hiroshi Tanaka
- 👤 Yoshihiro Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:24
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/64; C04B35/645; C04B35/01; C04B35/10; C04B35/111; C04B35/515; C04B35/56; C04B35/5607; C04B35/5611; C04B35/71
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
66 words
A METHOD OF MAKING A CERAMIC SINTERED BODY, COMPRISING PREPARING A POWDER-MIXTURE CONSISTING ESSENTIALLY OF 40 TO 80 PERCENT BY WEIGHT OF ALUMINUM 16 TO 40 PERCENT BY WEIGHT OF TITANIUM CARBIDE AND 4 TO 20 PERCENT BY EIGHT OF TITANIUM AND HOT PRESSING THE MIXTURE AT A TEMPERATURE OF FROM ABOUT 1720* TO 1850*C AND UNDER A PRESSURE OF FROM ABOUT 100 TO 300 KG/CM2.
Claim 2
Independent Claim
66 words
A METHOD OF MAKING A CERAMIC SINTERED BODY, COMPRISING PREPARING A POWDER-MIXTURE CONSISTING ESSENTIALLY OF 40 TO 80 PERCENT BY WEIGHT OF ALUMINUM 16 TO 40 PERCENT BY WEIGHT OF TITANIUM CARBIDE AND 4 TO 20 PERCENT BY EIGHT OF TITANIUM AND HOT PRESSING THE MIXTURE AT A TEMPERATURE OF FROM ABOUT 1720* TO 1850*C AND UNDER A PRESSURE OF FROM ABOUT 100 TO 300 KG/CM2.
Claim 3
Independent Claim
108 words
A method of making a ceramic sintered body, comprising preparing a powder-mixture consisting essentially of 40 to 80 percent by weight of alumina, 16 to 40 percent by weight of titanium carbide which contains a trace of free carbon, and 4 to 20 percent by weight of titanium, and hot pressing the mixture within a mold of graphite at a temperature of from about 1720* to 1850*C and under a pressure of from about 100 to 300 kg/cm2 for 10 to 60 minutes so as to make a portion of the titanium react with the free carbon and to form sub-titanium carbide which combines well with the alumina.
Claim 4
Independent Claim
108 words
A method of making a ceramic sintered body, comprising preparing a powder-mixture consisting essentially of 40 to 80 percent by weight of alumina, 16 to 40 percent by weight of titanium carbide which contains a trace of free carbon, and 4 to 20 percent by weight of titanium, and hot pressing the mixture within a mold of graphite at a temperature of from about 1720* to 1850*C and under a pressure of from about 100 to 300 kg/cm2 for 10 to 60 minutes so as to make a portion of the titanium react with the free carbon and to form sub-titanium carbide which combines well with the alumina.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |